Stuffing box



Dec. 27, 1932. BERGSKAUG 1,892,377

' STUFFING BOX Filed oct. 15, 1930 IN V EN TOR.

Karl B ergskaug.

A TTORNEYS.

Patented Dec. 27, 1932 1mm, nnnesxAnG, or BROOKLYN, :NEW YORK gramme Box.Applieationfiled October 15,1930. seea'1.n .i s, oa. y

' his invention relates to a functionally and i structurally improvedstufiing box capable of use in numerous di'iferent associations, butprimarily intendedl for employment with condensers and similarapparatus.

It is an object ofthe invention to provide a structure of this'natureand with which packing may be associated in such manner and pressures,and will prevent effectually.

the escape of fluid underthese circumstances and-in which moreover whenit is desirableafter a certain amount of useto tighten the packing, thismay be accomplished with the eXpenditureof minimum effort and time."

Another object is that of providing a device of this naturewhich willembody a simple and ruggedconstru'ction operating for indefinite periodsof time with vfreedom from difticulties, and .which, moreover may beprovided at minimum cost in addition to the fact that initial andsubsequent packing operations may be achieved without the use ofespecially skilled labor or a great amount of time.

lVith these and other objects in mind, reference is had to the attachedsheetof drawing illustrating one practical embodiment of the invention,and in which i Fig. 1 is a sectional view of one form of stufling boxconstructed within the terms of the present invention; and

F ig. 2 is an enlarged fragmentary view of this structure.

In these views, the numeral 5 indicates the same form a part of anespecial interposed mounting member I Thus, it will be observed that thebores present inventionf-that a plug 8 be mounted 'bythe screwthreadsjat the outer end of the V the plug 'is screwed home to compressthe tube, and especially provides sealsadjacent the shoulder-definingthe inner endo'fthe enlarged bore portion and also the inner edge tube'6. The bore'i's extended and enlarged beyond its innerend to provide aspacesuch that the walls of-thetube Wi'llbe out of contact with'th'efacebf this space. .-In turn,

beyond this point the bore is preferably screw W threaded. i j--I'nusing the invention, the; tubes are posiby means of a suitable'-implement,-a packing (one only o'ffwhich' has been illustrated)'formed in the plate include preferably an innerreducedportion having adiameter such that'it snugly accommodates the end of the 'tionedwiththeir ends within the boresand substance which maybe in the nature of aM coiled strip 7 is interposed between the'eX- space to prevent theescapeoffluid past the same, but it"is,moreover, contemplated by thebore, and have an iuithre'aded inwardly extending skirt portion 9 whichbears against the inner face of the packing, and serves when packingtoa=point at which therecan-be substantially no escape offiuid evenin'the event that the "parts are subj ected to pressure farbeyondthosewhichthey are normally called v 7 .upon to sustain. It isobvious that' by screwing the plug 8-down,-the:pressureto which thepacking is subjeetedis increased to' such an extent that this packing isforcedinto-intimate contact with the 'faces of the bore and of the plugskirt 9.

Asa resultof'thisconstruction, it is unnecessary inipacking a condenserto apply the packing materialwithinascreW thread bore.

portion; "=Consequently;, the packing is not che'wedl- Moreover, itwill-be noted that V the plug provides ample space 10 between the innerend"of the tube fandits innerface. .9 5

Consequently,- thetu-be is free to expand and retract under variabletemperature conditions tended-portions of the bore and the outer face170 without'this movement in any way'effecting a mutilationofthepacking.Mo're especial- :lyySllQ/h contraction and expansion will result merelyin a sliding contact between the packing and tube without the packingbeing subjected to any wedging .or destructive act-ion,

unnecessary to thread throughout their' en tire. length, theboresj ofthe-tube sheet, thus reducing materially the cost of manufacture. Also,in iew of the fact. that the faces between which the packing'is disposedare not screw threaded, the fluid cannot seep along any screwthreads ashas been the case in the past. Moreover, it is unnecessary in condenserand similar work to roll over the ends of the tubes as has beenpreviously attempted in order to overcome difiiculties in thisconnection. Incidently, Where such a construction has been resorted toat one tube end, the movement at the opposite tube end has, of course,been increased which has resulted in the packing more quickly beingrendered useless. Finally, due to the fact that the packing is tightenedand maintained in sealing contact by the plug or ferrule 8, it will befound that it will under usual circumstances never lie-necessary torethread' the tube sheet of the condenser or similar apparatus. 7

From the foregoing, it will be understood that among others the severalobjects of the invention as specifically aforementioned are achieved. Itwill be appreciated that numerous changes in construction andrearrangements of the parts might be resorted to without departing fromthe spirit of the invention as defined by the claims.

7 Having described myinvention, What I 7 claim as new and desire tosecure by Letters Patent, is:

1. A stuiiing box for tubes including, in combination, a tube sheetformed with a bore extending through the same, said bore comprising two,unequal diameters, a shoulder formed in said bore and defining theboundary'betweenthose portions ofthe bore presenting greater and lesserdiameters, smooth side walls in said bore inthe section of greatestdiameter and ad acent said shoulder, the remainder of said section ofgreatest diameter being screw threaded,a tube slidable within 7 i saidbore and of a diameter substantially that of said bore section of lesserdiameter whereby an annular spaceis providedbetween said against thesmooth walls and of a width no greater than the smooth portion of thewalls and adapted to fill the same and a screw threaded ferrule forcooperation with the screw threads in said bore, said ferrule beingformed with a smooth outer wall adjacent the leading edge thereof forslidable contact withthe smooth side walls of said bore of greatestdiameter, said leading edge adapted to engage said packing to compressthe same in the space between the tube and the smooth bore and beyondsaid screw threaded portion, while the opposite end of the ferruleprojects outside the outer face of the tube sheet.

21A 'stufiing box comprising a tube sheet ,formed with an aperture, saidaperture defining two bores of substantially different diameter, ashoulder in said aperturedefining .theboundary betweensaid bores, smoothside walls'm the larger of said bores ad acent said shoulder, a tube ofsubstantially the same diameter as the smaller of said bores and adaptedto be positioned within said aperture whereby an annular opening isformed between the side walls of said-larger bore and g said tube atsaid smooth walls, a non-metallic Woundpacking of a. width no greaterthan the smooth portion of the WZLllS- adapted to set upon said shoulderand substantially fill said annular opening opposite said smooth walls,a ferrule, a smooth surfaced band forming the leading edge thereof, saidband being of substantially the same diameter as the larger of saidbores and in contact with said smooth walls and means carried by saidferrule and said aperture whereby said leading edge engages said packingto compress the same between said smooth walls and said tube. V

I In testimony whereofl afiix my signature.

,KARL BERGSKAUG.

tube and said smooth bore in the section of greatest diameter of thelatter, a wound strip

